I wonder what a gunsmith would charge to do a mill/insert job on that. It might be worth it.
I don't know what GS's shop rates are, but my commercial machine shop rate is $85 an hour. A job like that would quickly make it a very valuable gun, but only to the guy who paid for it!
I have CNC produced 416 stainless triggers to replace the plastic triggers on Colt Mustangs, Mustang Plus II's, MK IV Government .380's and Sig P-238's. Video on installation in Sig;http://www.youtube.com/watch?v=Jh2v_-87DRM
Plus Llama .32 and .380 recoil spring buttons, checkered nicely and blued.